DBus changes for implementing local GATT attributes.

device/bluetooth/dbus/bluetooth_gatt_service_service_provider_impl.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "device/bluetooth/dbus/bluetooth_gatt_service_service_provider_impl.h"
+
+#include "base/bind.h"
+#include "base/logging.h"
+#include "third_party/cros_system_api/dbus/service_constants.h"
+
+namespace bluez {
+
+namespace {
+
+const char kErrorInvalidArgs[] = "org.freedesktop.DBus.Error.InvalidArgs";
+const char kErrorPropertyReadOnly[] =
+    "org.freedesktop.DBus.Error.PropertyReadOnly";
+
+}  // namespace
+
+BluetoothGattServiceServiceProviderImpl::
+    BluetoothGattServiceServiceProviderImpl(
+        dbus::Bus* bus,
+        const dbus::ObjectPath& object_path,
+        const std::string& uuid,
+        const std::vector<dbus::ObjectPath>& includes)
+    : origin_thread_id_(base::PlatformThread::CurrentId()),
+      uuid_(uuid),
+      includes_(includes),
+      bus_(bus),
+      object_path_(object_path),
+      weak_ptr_factory_(this) {
+  VLOG(1) << "Creating Bluetooth GATT service: " << object_path_.value()
+          << " UUID: " << uuid;
+  DCHECK(!uuid_.empty());
+  DCHECK(object_path_.IsValid());
+  DCHECK(bus_);
+
+  exported_object_ = bus_->GetExportedObject(object_path_);
+
+  exported_object_->ExportMethod(
+      dbus::kDBusPropertiesInterface, dbus::kDBusPropertiesGet,
+      base::Bind(&BluetoothGattServiceServiceProviderImpl::Get,
+                 weak_ptr_factory_.GetWeakPtr()),
+      base::Bind(&BluetoothGattServiceServiceProviderImpl::OnExported,
+                 weak_ptr_factory_.GetWeakPtr()));
+
+  exported_object_->ExportMethod(
+      dbus::kDBusPropertiesInterface, dbus::kDBusPropertiesSet,
+      base::Bind(&BluetoothGattServiceServiceProviderImpl::Set,
+                 weak_ptr_factory_.GetWeakPtr()),
+      base::Bind(&BluetoothGattServiceServiceProviderImpl::OnExported,
+                 weak_ptr_factory_.GetWeakPtr()));
+
+  exported_object_->ExportMethod(
+      dbus::kDBusPropertiesInterface, dbus::kDBusPropertiesGetAll,
+      base::Bind(&BluetoothGattServiceServiceProviderImpl::GetAll,
+                 weak_ptr_factory_.GetWeakPtr()),
+      base::Bind(&BluetoothGattServiceServiceProviderImpl::OnExported,
+                 weak_ptr_factory_.GetWeakPtr()));
+}
+
+BluetoothGattServiceServiceProviderImpl::
+    ~BluetoothGattServiceServiceProviderImpl() {
+  VLOG(1) << "Cleaning up Bluetooth GATT service: " << object_path_.value();
+  if (bus_)
+    bus_->UnregisterExportedObject(object_path_);
+}
+
+BluetoothGattServiceServiceProviderImpl::
+    BluetoothGattServiceServiceProviderImpl(const dbus::ObjectPath& object_path,
+                                            const std::string& uuid)
+    : origin_thread_id_(base::PlatformThread::CurrentId()),
+      uuid_(uuid),
+      bus_(nullptr),
+      object_path_(object_path),
+      weak_ptr_factory_(this) {}
+
+bool BluetoothGattServiceServiceProviderImpl::OnOriginThread() {
+  return base::PlatformThread::CurrentId() == origin_thread_id_;
+}
+
+void BluetoothGattServiceServiceProviderImpl::Get(
+    dbus::MethodCall* method_call,
+    dbus::ExportedObject::ResponseSender response_sender) {
+  VLOG(2) << "BluetoothGattServiceServiceProvider::Get: "
+          << object_path_.value();
+  DCHECK(OnOriginThread());
+
+  dbus::MessageReader reader(method_call);
+
+  std::string interface_name;
+  std::string property_name;
+  if (!reader.PopString(&interface_name) || !reader.PopString(&property_name) ||
+      reader.HasMoreData()) {
+    std::unique_ptr<dbus::ErrorResponse> error_response =
+        dbus::ErrorResponse::FromMethodCall(method_call, kErrorInvalidArgs,
+                                            "Expected 'ss'.");
+    response_sender.Run(std::move(error_response));
+    return;
+  }
+
+  // Only the GATT service interface is allowed.
+  if (interface_name !=
+      bluetooth_gatt_service::kBluetoothGattServiceInterface) {
+    std::unique_ptr<dbus::ErrorResponse> error_response =
+        dbus::ErrorResponse::FromMethodCall(
+            method_call, kErrorInvalidArgs,
+            "No such interface: '" + interface_name + "'.");
+    response_sender.Run(std::move(error_response));
+    return;
+  }
+
+  // Return error if |property_name| is unknown.
+  if (property_name != bluetooth_gatt_service::kUUIDProperty &&
+      property_name != bluetooth_gatt_service::kIncludesProperty) {
+    std::unique_ptr<dbus::ErrorResponse> error_response =
+        dbus::ErrorResponse::FromMethodCall(
+            method_call, kErrorInvalidArgs,
+            "No such property: '" + property_name + "'.");
+    response_sender.Run(std::move(error_response));
+    return;
+  }
+
+  std::unique_ptr<dbus::Response> response =
+      dbus::Response::FromMethodCall(method_call);
+  dbus::MessageWriter writer(response.get());
+  dbus::MessageWriter variant_writer(NULL);
+
+  if (property_name == bluetooth_gatt_service::kUUIDProperty) {
+    writer.OpenVariant("s", &variant_writer);
+    variant_writer.AppendString(uuid_);
+    writer.CloseContainer(&variant_writer);
+  } else {
+    writer.OpenVariant("ao", &variant_writer);
+    variant_writer.AppendArrayOfObjectPaths(includes_);
+    writer.CloseContainer(&variant_writer);
+  }
+
+  response_sender.Run(std::move(response));
+}
+
+void BluetoothGattServiceServiceProviderImpl::Set(
+    dbus::MethodCall* method_call,
+    dbus::ExportedObject::ResponseSender response_sender) {
+  VLOG(2) << "BluetoothGattServiceServiceProvider::Set: "
+          << object_path_.value();
+  DCHECK(OnOriginThread());
+
+  // All of the properties on this interface are read-only, so just return
+  // error.
+  std::unique_ptr<dbus::ErrorResponse> error_response =
+      dbus::ErrorResponse::FromMethodCall(method_call, kErrorPropertyReadOnly,
+                                          "All properties are read-only.");
+  response_sender.Run(std::move(error_response));
+}
+
+void BluetoothGattServiceServiceProviderImpl::GetAll(
+    dbus::MethodCall* method_call,
+    dbus::ExportedObject::ResponseSender response_sender) {
+  VLOG(2) << "BluetoothGattServiceServiceProvider::GetAll: "
+          << object_path_.value();
+  DCHECK(OnOriginThread());
+
+  dbus::MessageReader reader(method_call);
+
+  std::string interface_name;
+  if (!reader.PopString(&interface_name) || reader.HasMoreData()) {
+    std::unique_ptr<dbus::ErrorResponse> error_response =
+        dbus::ErrorResponse::FromMethodCall(method_call, kErrorInvalidArgs,
+                                            "Expected 's'.");
+    response_sender.Run(std::move(error_response));
+    return;
+  }
+
+  // Only the GATT service interface is allowed.
+  if (interface_name !=
+      bluetooth_gatt_service::kBluetoothGattServiceInterface) {
+    std::unique_ptr<dbus::ErrorResponse> error_response =
+        dbus::ErrorResponse::FromMethodCall(
+            method_call, kErrorInvalidArgs,
+            "No such interface: '" + interface_name + "'.");
+    response_sender.Run(std::move(error_response));
+    return;
+  }
+
+  std::unique_ptr<dbus::Response> response =
+      dbus::Response::FromMethodCall(method_call);
+  dbus::MessageWriter writer(response.get());
+  WriteProperties(&writer);
+  response_sender.Run(std::move(response));
+}
+
+void BluetoothGattServiceServiceProviderImpl::WriteProperties(
+    dbus::MessageWriter* writer) {
+  dbus::MessageWriter array_writer(NULL);
+  dbus::MessageWriter dict_entry_writer(NULL);
+  dbus::MessageWriter variant_writer(NULL);
+
+  writer->OpenArray("{sv}", &array_writer);
+
+  array_writer.OpenDictEntry(&dict_entry_writer);
+  dict_entry_writer.AppendString(bluetooth_gatt_service::kUUIDProperty);
+  dict_entry_writer.AppendVariantOfString(uuid_);
+  array_writer.CloseContainer(&dict_entry_writer);
+
+  array_writer.OpenDictEntry(&dict_entry_writer);
+  dict_entry_writer.AppendString(bluetooth_gatt_service::kIncludesProperty);
+  dict_entry_writer.OpenVariant("ao", &variant_writer);
+  variant_writer.AppendArrayOfObjectPaths(includes_);
+  dict_entry_writer.CloseContainer(&variant_writer);
+  array_writer.CloseContainer(&dict_entry_writer);
+
+  writer->CloseContainer(&array_writer);
+}
+
+void BluetoothGattServiceServiceProviderImpl::OnExported(
+    const std::string& interface_name,
+    const std::string& method_name,
+    bool success) {
+  LOG_IF(WARNING, !success) << "Failed to export " << interface_name << "."
+                            << method_name;
+}
+
+const dbus::ObjectPath& BluetoothGattServiceServiceProviderImpl::object_path()
+    const {
+  return object_path_;
+}
+
+}  // namespace bluez